Alright guys need some opinions. Ive got 4" straight exhaust back to a single 5" stack. LOVE THE SOUND. Id like to quiet the cab down a little. Anyone had any experience with sound insulation? Any suggestions. I know there is no insulation on the back of the cab behind the rear seat, so I was planning on doing something to atleast this. I went and talked to a stereo shop and he priced me on some DYNOMAT spray in insulation. He said this stuff WORKS. I like the exhaust too much to change it. Any suggestions or experience?

 

Most of the sound in the cab that you are getting is comming from the back glass. The sound from the exhaust is bouncing off of it. I don't have experience with stacks. (wish i did) But if you take a piece of alluminum and some weather stripping and block the gap between the cab and the bed it may help. Keeps some of the sound from the road and the exhaust from coming up between the cab and the bed. If you have a toolbox the sits on the top of the bed it makes the sound in the cab worse. More room for the sound to bounce into the glass. Hope this helps.

 

http://www.b-quiet.com/<br>, great place to get sound deadner .............bought a 70 sq ft roll of brown bread there last fall works great<br>

 

Look in McMastercarr.com and search for vibration dampener. Its in a 5 gallon pail and you can do many trucks with that much. It spreads like thick drywall mud, I put it on all that bare metal behind the back seat....helped a lot! About 75.00 a pail.<br><br>Michael

 

I did my inside with Brown Bread from B-Quiet. I didn't notice any signfigant noise reduction. Dynamat is of similar material so I don't know what the others did but my truck is noisy on the inside especially at higher speeds (65mph +).

The biggest sound reduction for me was putting a hood liner on my truck.

Here's a link to some of my installation pictures:

Noise reduction installation pictures




-CM

 

Gentlemen,<br> I purchased the ATP wrap for my 2002. It wasn't cheap :'(, but it quieted down the ride. Especially when the overdrive was off pulling my camper, the noise was deafening at 2700RPM's. . I'd say about 25% reduction in noise. Of course, I still have that beautiful CTD sound 8), but not as loud. Take a look at the website. Adios. ;D <br><br>http://atpwrap.com/dodge_ram.htm

 

For dynomat try thezeb.com they had the best price by far of anybody I could find. Also there is gsi foam that alot of the tdr members have been using with what sonds like excellent results. Check out the following links for tons of info<br><br>http://www.turbodieselregister.com/f...ound+deadening<br><br><br>http://www.turbodieselregister.com/f...ound+deadening

 

I have used the GSI (Great Southern Insulation) 1/2&quot; SoundStop foam all throughout the inside of my quad cab, except for the roof, and it does a pretty decent job. My cab wasn't very noisy until I removed the muffler on my 4&quot; Jardine exhaust, and then I got the dreaded drone from 1900 - 2300 RPM and it was BAD!! It is still nasty, but much better now than before the GSI foam. I am going to do the headliner soon as well.<br><br>Tom

 

This past weekend the weather finally cooperated and I installed dynomat xtreme and brownbread that has been sitting in the garage for 2 months in the truck and it helped. I also ran out and didn't get finished. I didn't have a sound meter so can't give real results but my ears say it is less. I did the front doors inside of outside skin, inside of inside skin and outside of inside skin wherever possible. Did that on both front doors and the rear qc doors. Put 2 layers on the back wall. I didn't take off the b-pillars but got back into the corners pretty well. Also did the rear floor from the back wall to the back of the front seats with 2 layers. I also put some as much as I could reach into the cowl area. I definitely have less road noise and exhaust noise. Looking forward to getting some more and doing under the front seats and up the firewall as far as possible. even with that don't expect the quietness of a lexus but it sure will take the edge off. By the way since I used both Dynomat xtreme and Brown Bread I can say the dynomat seemed to be a higher quality item but also much more expensive.

 

seems that some of you guys have had success and others haven't. The answer may lie in understanding the nature of the sounds you wish to diminish, and the methods most appropriate to do so. For example, reducing in-cab engine noise is fundamentally a different task than damping the door skins for stereo improvements. I'm not saying it won't help -- I'm saying that it is best to understand the problem first before you jump to a solution.<br><br>dynamat is fundamentally a &quot;damping&quot; material. it adds mass to whatever it attaches to, so that the surface no longer vibrates. there are other similar materials of course, but dynamat has good damping performance. One common use in car stereos, for example, is to apply such material to the door skins so that they don't vibrate in response to music coming from your installed speakers. speaker cones are the only thing you want vibrating <br><br>with that in mind, note that adding mass to the cab skins may not be the most effective means of reducing in-cab engine noise. It will help, but it may not be the most effective. you need a sound absorbing material instead (or perhaps in addition), to act as a sound barrier, and applied to the right places. now then, dynamat will act as a sound absorbing material as well, but that is not it's strong point -- there are other materials that will do better in that department.<br><br>The most effective approach is to do both: quiet down your internal walls by adding mass to them so they don't vibrate. Use dynamat, or similar mass-adding material, as this will prevent your cab walls from becoming speakers. In addition, install sound absorbing material to block the sound itself. Cascade sells some sound absorbing material that would be especially effective for seat pans and also for hood liners.<br><br>The seat pan and firewall are good examples where sound absorbtion is probably more important than sound damping -- as effective measures to reduce in-cab engine noise. I would expect asphalt based or dynamat type materials to be only partially effective at noise coming from the road and the engine compartment, because the seat pan and firewall is going to vibrate anyway and a damping material will be no match. What you need here is sound absorbing material. <br><br>Check out parts express for &quot;Cascade&quot;. They've got both sound damping and sound absorbing materials there that will enable you do get the best of both worlds. I would especially consider putting something other than dynamat down on the seat pan and on the firewall. Dynamat will help, and many have had good success, but the theory of sound suggests that you'll have better success with a different material more suited to sound absorbing than to vibration damping. Of course, do both and you'll be most happy <br><br>Keeping the noise in the engine compartment is also a valuable goal. the valve cover is a huge source of noise, so a cover for this would proabably be effective -- especially in addition to a real hood liner. as for exterior noise, the oil pan is also a great noise producer. so why not cover that?<br><br>I'm looking for a (cost effective) high temperature sound absorbing material to put around the exhaust pipe itself. seems that may be a good way to keep exhaust noise out of the cab.

 

I totally agree with Doug. I just did the dynomat thing see my previous post. It helped but I can already see that it is not going to diminish the engine noise much when I get finished with the front 1/2 of the cab. It did quiet down the road/exhaust noise particulary the noise coming from the back wall, my doors have a much more solid sound when closing and the stereo definitely sounds better while cruising. I am thinking that blocking the noise at the source will be the most effective such as the atp wrap or like products for the valve cover, oil pan etc and they are certainly easier to install than removing the inside of the cab. In the end they may not be much more expensive than just using dynomat or the like. As he mentioned both would be the best and most effective. I personally will finish the front of the cab with dynomat and then start to look hard at the atp or like products.

 

I put Dynamat all along my back wall and it helped alot. It's still loud as h*** in the truck (dumped exhaust tends to do that ), but it doesn't droan hardly at all anymore. Later on down the road, I'm going to do the back floor board and doors, and the front doors. But only for the same reason that Jamie did, to make my stereo sound louder.

 

97 4X4<br><br>In Feb of this year I installed Sirius Satellite Radio but there was so much cab noise that I had to turn up the volume way to much. So .. this is what I did.<br><br>Took out all the seats, including the rear seat. Removed the rug and the door panels.<br><br>Installed 1 layer of Brown bread on the floor in the doors and up the rear cab area. Put in one layer of B-Quite Lcomp over the Brown Bread on the floor under the seats and up the fire wall as far as I could. Lcomp is a noise barrier composite consisting of a 1/4&quot; absorber foam with a black urethane film facing, a lead barrier and a 1/4&quot; thick foam decoupler. It has a total thickness of 1/2&quot;, weighs approximately 1 lb/sq. ft. and it is highly moldable to form to the contours of your vehicle.<br><br>Installed a hood liner.<br><br>Just finished a 3,000 mile trip pulling a 30 foot 5th wheel and am very satisfied with the results. When I'm pulling up hill etc. the engine is still noisy, but nothing like it was. And almost no fatigue from road noise. In fact, road noise is almost nonexistent. The engine is just a murmur at crusing speed in 5th.<br><br>I would recommend this process. Even though it took several hours it was worth it. My total cost was around $500.00.<br><br>I also recommend the Sirius radio. I'm kind of a news junkie and it was great to cruise down the road listing to Fox, CNN or Oldies but Goodies. The only time we lost the siginal was on the California coast while driving through heavy forested areas. And, for some strange reason, while we were driving across Nevada close to area 51, through Rachiel, and the Nevade test range.<br><br>Stan Evans

 

I put brown Bread Everywhere floor roof doors inner and outer. I used 3 layers everywhere. I also used a piece of 3/4&quot; plywood which I covered in speaker box cover and then siliconed it to the back wall. This stopped alot of noise. I then put 3 layers of brownbread on the hood and then installed the hood liner over top. I even brownbreaded the fenders under the hood and parts of the firewall. My truck is now really quiet! Its great I recommend this its pretty cheap the brown bread is quite a bit better then the dynamat and a heck of alot cheaper.